problem with flash write and linker file attribute section

i have edit linker file in 2 section one for bootloader and one for my app. code

now when in my application code i write only simple LED blinking code in that case my bootloader code allow to flash write that app code in particular location of flash but when i add my application code in details something like around 60KB length of that code it does not allow me to write that code in flash.

i found that some of my app code are automatically transfer in my bootloader code section thats why i think this problem is create.